Snes/Nes ROMs not launching

mitu

@sleve_mcdichael said in Snes/Nes ROMs not launching:

your values may be different because it's not the same file ...

If they're different, then most likely the ROM is corrupt/incorrect - this is the test for checking the integrity of the file.
For reference, here are the checksums for a correct Chrono Trigger (U) ROM.

sleve_mcdichael

@mitu ah, I wasn't sure if Chrono Trigger (U) [!].smc and Chrono Trigger (USA).sfc were necessarily the same file though, I know there can be different versions of some of them.

2001 Honda Civic

@sleve_mcdichael
Thank you for that info, looks like it may be corrupt?

Crc32 is all 0's. I also checked the sum of the same file that's on my PC (the one i copied over to the Pi) and the checksums are different than what's on the Pi.

I also noticed that the link you gave for the correct checksums is a .sfc. Mine is .smc, is that going to affect the checksum? And if yes, can I just change the m to an f ?

mitu

@2001-Honda-Civic said in Snes/Nes ROMs not launching:

I also noticed that the link you gave for the correct checksums is a .sfc. Mine is .smc, is that going to affect the checksum? And if yes, can I just change the m to an f ?

No, the name of the file doesn't matter, the checksum looks only at the content.

The Chrono Trigger ROM file is empty - you should transfer it again from your PC. If the checksum is still different after that, your sdcard may be having issues.

sleve_mcdichael

@2001-Honda-Civic no, filename won't affect the checksum, only content will.

pi@retropie:~/temp $ echo "foo == bar" > test.txt
pi@retropie:~/temp $ cat test.txt
foo == bar
pi@retropie:~/temp $ cp test.txt something.else
pi@retropie:~/temp $ cat something.else
foo == bar
pi@retropie:~/temp $ crc32 test.txt 
1cd10d59
pi@retropie:~/temp $ crc32 something.else 
1cd10d59
pi@retropie:~/temp $ md5sum test.txt 
da7c11dc714cbd8082747174450aeff3  test.txt
pi@retropie:~/temp $ md5sum something.else 
da7c11dc714cbd8082747174450aeff3  something.else
pi@retropie:~/temp $ sha1sum test.txt 
c7f01e82449cd92e8dd3a70864ebf90446ecb760  test.txt
pi@retropie:~/temp $ sha1sum something.else 
c7f01e82449cd92e8dd3a70864ebf90446ecb760  something.else

2001 Honda Civic

@sleve_mcdichael Alright so I just tried a fresh ROM, and it works fine as a .zip. I'm not sure how, but the ROMs that worked on my last pi4 build are now all corrupt? Guess I'll go redownload them all. Thank you guys for the help, I feel dumb for not trying that first.

sleve_mcdichael

@2001-Honda-Civic said in Snes/Nes ROMs not launching:

Crc32 is all 0's.

That does seem weird. Not sure how that happens even.

I also checked the sum of the same file that's on my PC (the one i copied over to the Pi) and the checksums are different than what's on the Pi.

Also strange, but more explainable if the transfer just got corrupted. Do the values on your computer match the "good" values shown above? At least then you'd know if you're working with a good source file.

mitu

@sleve_mcdichael said in Snes/Nes ROMs not launching:

That does seem weird. Not sure how that happens even.

It's an empty file:

$ touch my.rom && ls -l my.rom && crc32 my.rom
-rw-r--r-- 1 pi pi 0 Jun  6 20:13 my.rom
00000000

2001 Honda Civic

@sleve_mcdichael I took the chrono trigger zip and it ran just fine on my phone (snes9x). But the file on my pc did not match the values either..

sleve_mcdichael

@2001-Honda-Civic the zip is compressed, so you would have to unzip it and compare the raw uncompressed file.

If it's working, though, it's probably the right one.